Brown suffered a cut on his chin and his girlfriend, Karrueche Tran, was later treated for a possible concussion, sources said

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Police are investigating a bar brawl that erupted after a dispute between Chris Brown and Drake early Thursday at a Manhattan nightclub, NBC 4 New York has learned.

In the melee, Brown was struck on the chin by a bottle and suffered a small cut, sources tell NBC 4 New York. He told police that he did not see who threw the bottle. His girlfriend, Karrueche Tran, was later treated for a possible concussion, sources said.

Sources tell NBC 4 New York that earlier in the night, Brown sent a bottle of Champagne to Drake's table as a peace offering because the pair have had an ongoing dispute. Drake then allegedly sent back the bottle with a note that he was still sleeping with Rihanna, Brown's ex-girlfriend.

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Brown's bodyguard has told detectives that the rappers exchanged words, sources said. And then as Brown was leaving the SoHo club with his bodyguard, members of Drake's entourage confronted him.

Witnesses say there was a brief staredown between the groups, and members of Drake's group removed their shirts. Pushing and shoving then ensued.

Brown was interviewed by police Thursday, sources tell NBC 4 New York, and disputed part of that account. He told police that he was approached by two men who asked him what his problem was with Drake, and told them that he had no problem.

Brown then told police that as he was leaving, several men stood in front of him on the dance floor and removed their shirts. Brown told police that he did not see Drake, sources said.

Sources tell NBC 4 New York that someone in the crowd threw ice, and then bottles were thrown.

Brown's bodyguard was struck in the head and Brown was escorted out of the club into a waiting car.

Five other people who were injured appeared to have no association with either singer.

At this point, a source says there's no indication Brown or Drake committed a crime.

A spokesman for Brown said the singer, his girlfriend and friends "were victims of a brutal attack" at the club.

"They sustained several injuries," the spokesman said. "Chris and his party are cooperating with NY authorities who are pursuing this incident further."

A rep for Drake said in a statement that he "did not participate in any wrongdoing of any kind" at the club.

"He was on his way out of the club when the altercation began," the statement said. "He did not engage in any activity which resulted in injury to person or damage to property."

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